Fluctuation dynamo amplified by intermittent shear bursts in convectively driven magnetohydrodynamic turbulence
Solar and Stellar Astrophysics
2013-09-06 v4 Computational Physics
Abstract
Intermittent large-scale high-shear flows are found to occur frequently and spontaneously in direct numerical simulations of statistically stationary turbulent Boussinesq magnetohydrodynamic (MHD) convection. The energetic steady-state of the system is sustained by convective driving of the velocity field and small-scale dynamo action. The intermittent emergence of flow structures with strong velocity and magnetic shearing generates magnetic energy at an elevated rate over time-scales longer than the characteristic time of the large-scale convective motion. The resilience of magnetic energy amplification suggests that intermittent shear-bursts are a significant driver of dynamo action in turbulent magnetoconvection.
Keywords
Cite
@article{arxiv.1304.0190,
title = {Fluctuation dynamo amplified by intermittent shear bursts in convectively driven magnetohydrodynamic turbulence},
author = {J. Pratt and A. Busse and W. -C. Mueller},
journal= {arXiv preprint arXiv:1304.0190},
year = {2013}
}